Questions tagged [code-review]
This tag is intended for the review and improvement of style for already functioning code. It not meant to change the objective of the code.
423
questions
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How to use an "otherwise" clause in `Which`
I want to classify a set of vectors according to the number and position of zeroes they contain. The components of the vectors are non-negative. I'm using
...
- 541
0
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0
answers
61
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How do we define the function near the end of my post?
Suppose I have two sets $F_{1,n}$ and $F_{2,n}$ written as:
...
- 199
5
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4
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398
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Is there a more elegant solution than f[a, b, Sequence@@#3,...]?
I am trying to construct a list of many possible combinations using Outer and Permutations. Something that looks like that:
<...
- 244
1
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0
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45
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How to rescale list to interval $(0,1)$ [closed]
Imagine I have an arbitrary list
l = RandomReal[{-5, 10}, 10]
Out[]= {4.17452, 1.75762, 4.16905, -3.63225, 8.34172, 5.39626, -4.2107, 3.50873, -1.52441, -3.7147}
...
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88
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0
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0
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55
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Code Producing FindMinimum::nrnum; how do we fix it?
Suppose $A=\left\{\sqrt{m}:m\in\mathbb{N}\right\}$ and $S\subseteq A$:
I wish to create a code which finds:
$$\min\left\{c:\forall(d\in S)\exists(c\in A)\left(c/d\in A\right),\max(S)\le c \le \prod\...
- 199
1
vote
1
answer
43
views
Check certain expression using a while loop to run through all posibilities in a range
Well, I have written the following code (using the fast square root test found in this answer):
...
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1
vote
1
answer
46
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How to number each element of a list to form a table of points? [closed]
Suppose we have a list given below
OurList={a,b,c,d,e}
Is there a way to attribute a number to each element of OurList so that we could form a table of points? The ...
- 43
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0
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19
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Table of time-varing calculation slower to the point of kernel blowing up
There is a complicated function obtained by numerically solving a pde, let us call it $u(t,x,z)$.
For this $u$, I want to calculate the global maximum of $u^2$ at a fixed position of $z$, and plot ...
- 43
0
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0
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18
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How to apply NetDecoder on each element in output?
I try to apply the NetDecoder on each output element but get an error.
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3
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1
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60
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1
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1
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90
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0
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79
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How to fix Mathematica crashing in the following case?
I have a problem with Mathematica when trying to glue two tables together.
The tables have the form
...
- 3,542
4
votes
1
answer
189
views
Speeding up Fourier transform and eigenvector calculation
I have a matrix $M$ in Bloch basis (momentum space). Then I have to take Fourier transform of $M$ to go to real space. The size of this lattice in real space can be fixed to some value $N_{unit}$.
...
- 601
3
votes
1
answer
181
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Unbounded solution at boundaries with few combination of values in this BVP solution
I had asked a question here regarding solution to a BVP problem. bbgodfrey provided an excellent answer using the method of integrated least squares.
However, for a few specific set of values of ...
- 143
1
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0
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56
views
Code review of my animation of Ellipsoid method
Feel free to suggest improvements (code-review) to my two functions (calculation and animation).
They were made to visualize the workings of the Ellipsoid method in two dimensions.
For example, see ...
- 612
0
votes
1
answer
81
views
How to fourier transform a numerical solution?
I numerically solved a wave equation and want to fourier transform the solution uwave1(t,x,z) at a particular instant of time t and position z. The code is as follows:
...
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0
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76
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Shortest paths Knights Tour
I am trying to print the minimum steps needed to traverse a chessboard as a knight from one diagonal position to the other. I have the following code:
Building the chessboard
I started with creating ...
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0
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59
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My notebook backup function works fine. I am just asking for your critical review before submitting to FunctionRepository
Why the name and what does it do exactly?
Youre probably asking yourselves why I named it NotebookBackupStack. All that is explained in ...
- 1,647
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1
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40
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Updating the association with answers from the TrigProperties Function
I have created a list of rules I would like to update with values. My goal here is to be able to write the following:
...
0
votes
1
answer
55
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Check if a fraction leads to an integer, choose $r$ and run trough $0\le a\le n$ and go to $r+1$
Well, I am trying to do the following: I have two functions $y(r,a)$ and $z(r,a)$ and I want to check of the division of both those functions leads to an integer. In order to do that I want to choose ...
- 1,723
1
vote
1
answer
72
views
Outputting probability of rolling 6 dice N times, generating a new output each roll
I am looking to output the probability of n classic six-sided dice but I am not sure how to go about starting. This is what I have written out so far, but no way to go about accounting for n dice for ...
1
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2
answers
55
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Code should not evaluate at non-integers, fail at too few integers
I want this piece of code to sort a given list by odds first and evens last. This piece of code did the trick with the list I entered in:
...
4
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3
answers
310
views
Checking if a number is right sorted
I have a number $n$ such that the digits of $n$ are strictly increasing to the left except for the first digit. So for example when $n=51369$ fits the bill because:
$$1<3<6<9\tag1$$
Is there ...
- 1,723
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1
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60
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How to create a flexible BarChart[ ] with Manipulate[ ]
This question is nothing more than making a few changes to an already working code. I put that code into Manipulate[...] to be able to choose a subset of countries ...
- 4,391
3
votes
1
answer
93
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How to use RightComposition efficiently in the context of one-liners?
I find myself recently writting, more often than not, code that makes heavy use of RightComposition eg.
expr//f/*g/*h
It is relatively straightforward to first ...
- 122
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40
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1
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1
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71
views
How to dynamically link a bar chart to a table and present them in a single synchronized figure
This answer has addressed the question of presenting a bar chart and its data table together in a single figure. Not to repeat the same question, I should point out that the answer given is not ...
- 4,391
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1
answer
70
views
Parallelization in While[] loop when testing if a condition is met
Well, I am trying to run the following code:
...
- 1,723
1
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0
answers
66
views
Implementing the Binary GCD algorithm in Mathematica
Well, I have $n\in\mathbb{N}$ and I want to transform $n$ to a binary number which can be done using FromDigits[IntegerDigits[n, 2]]. I want to compute the ...
- 1,723
1
vote
1
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80
views
Parallel Mathematica-code that runs too slow when running PowerRepresentations[] function
Well, I am a student in elementary number theory and trying to find natural numbers that can be written as the sum of integers to the power of an integer. The code I am using now is the following:
<...
- 1,723
0
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0
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44
views
Solving a system of equations (works with squares not with fifth powers)
Well, I was trying to solve a system of equations in a different question of mine.
There @kglr gave a very efficient code for solving that system of equations using squares:
...
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3
votes
1
answer
83
views
Removing a element from list when obeying a certain condition
Well, I have the following code:
Select[PowersRepresentations[n, a, b],
DuplicateFreeQ[#] && ! MemberQ[#, 0] &]
This code finds ...
- 1,723
5
votes
3
answers
169
views
Permutation avoidance function
It is common for me to see if a permutation of 1,2,...,n, avoids some fixed permutation pattern. For example, the permutation [1,4,2,3,5]
contains the pattern 1,3,2, as the elements [1,4,3] appear in ...
- 2,292
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1
answer
75
views
how to draw a line at mean value of cross-section and time-series data using Bar Chart
I have Dataset;
...
- 4,391
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1
answer
81
views
1
vote
1
answer
55
views
Data parallelism for independent probabilistic trials
I'm considering the best way to implement the data parallelism features of Mathematica for a specific task. To that end I have a minimal code example below which contains the basic features of my ...
- 271
0
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0
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95
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Algorithms or Mathematica definition for functions ideals of polynomial Rings
This question was well posed four years ago without answer at Operations on ideals of polynomial rings. I asked again in Nov 2021 and posted possible function defininitions. Lichtblau commented ...
- 41
4
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3
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250
views
How to differently color the two time series using two-Y-axes
I produced the following time series ListLinePlot:
using the following Code (thanks to many of the contributors in this forum)
<...
- 4,391
4
votes
0
answers
116
views
What do “Analyze Notebook" and "Analyze Cells" Do?
What does "Analyze Notebook" and "Analyze Cells" do?
They seem to, at least, point out some coding errors that are already highlighted in a notebook. Do they do anything else?
Is ...
- 1,547
4
votes
1
answer
230
views
Using Mathematica to derive analytic form of single variable function
I am interested in finding an analytical form of the following function $f(n)$ defined as:
$$f(n):=\sum_{\{\bar{K}\}}\prod_{l<j}^{n}e^{ik_lk_j},$$ where $\{\bar{K}\}$ is the full set of binary ...
- 271
4
votes
1
answer
104
views
Binary permutation list code in Mathematica
Given some natural number $N$, I am interested in the set of all binary permutations of length $N$ (with the intention of storing in lists depending on how many $1$'s appear in each permutation). My ...
- 271
2
votes
1
answer
149
views
How to draw a barchart with a vertical line
The following code works just fine with a few caveats.
...
- 4,391
0
votes
0
answers
29
views
Should Expanding a function result in changes to its Plot?
(Title needs improving)
I'm trying to find the analytical expression for the attenuation of an AC voltage through a passive low-pass filter. The solution involves finding the time-dependent charge (<...
- 19.2k
2
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3
answers
149
views
What is the limit of the sum as `t` approaches infinity?
I am unable to find the limit of the following sum as t appraoches infinity
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- 199
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1
answer
68
views
Individual block diagonalisations take more time than single diagonalization of block matrix
Sample Problem of a large block matrix:
I want to find the lowest eigenvalue of a blockdiagonal matrix h[x] for a range of values of ...
- 902
0
votes
1
answer
30
views
How to resolve problem during summation of functions?
I am trying to find out the output of this basic problem but getting an error. If anyone can resolve this will be helpful.
...
- 83
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votes
1
answer
162
views
Calculating the sum of means of lists as `n` approaches infinity
I am unable to calculate the sum for larger values of n.
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- 199
3
votes
3
answers
152
views
How to produce {{1,40},{2,20}} from {{1, 10}, {2, 20}, {1, 30}}?
My attempt below produced a warning:
Total::normal: Nonatomic expression expected at position 1 in Total[y].
...
0
votes
0
answers
67
views
Determining whether a matrix is in Jordan canonical form
At first, I was surprised that Mathematica doesn't have a built-in function for this, e.g. JordanMatrixQ. Anyway, we all know that a Jordan matrix is consisted of ...
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